| Acronym | Definition |
|---|
| PHA | Phase |
| PHA | Periodic Health Assessment (US Army) |
| PHA | Public Housing Authority |
| PHA | Phytohemagglutinin (a polyclonal T-cell activator) |
| PHA | Process Hazard Analysis |
| PHA | Pulmonary Hypertension Association (Silver Spring, MD; formerly United Patients Association for Pulmonary Hypertension) |
| PHA | Polyhydroxyalkanoate |
| PHA | Prince Hall Affiliated (Freemason) |
| PHA | Personal Health Assessment |
| PHA | People living with HIV/AIDS |
| PHA | Preliminary Hazard Analysis |
| PHA | Public Housing Administration |
| PHA | Potentially Hazardous Asteroid |
| PHA | Preventive Health Assessment |
| PHA | Portland Housing Authority (Portland, ME) |
| PHA | Pakistan Housing Authority |
| PHA | People's Health Assembly |
| PHA | Partnership for Health and Accountability (Georgia) |
| PHA | Pelger-Huet Anomaly |
| PHA | Physical Health Assessment |
| PHA | Public Health Association of Australia |
| PHA | Philippine Hospital Association |
| PHA | Palomino Horse Association |
| PHA | Pinto Horse Association |
| PHA | Protocol Handler (ATM) |
| PHA | Push Accumulator on Stack (6502 processor instruction) |
| PHA | Position Hazard Analysis (USACE safety management action plan) |
| PHA | Preventative Health Assessment |
| PHA | Production Handling Agreement |
| PHA | Pullet Hatcheries Association (UK) |
| PHA | Pulse Height Analyzer/Analysis |
| PHA | Pulpwood Harvesting Area (forestry) |
| PHA | Pyramidal-Horn Antenna |
| PHA | President's House Association (Georgetown College; Kentucky) |
| PHA | Passenger Hold Area |
| PHA | Public Health Act (various locations) |
| PHA | Public Health Association (various organizations) |
| PHA | Public Housing Assessment |
| PHA | Public Health Advisory (US FDA) |
| PHA | Public Highway Authority |
| PHA | Public Health Administrator |